add_core_asset(): $in_footer should default to array

[montchr]

I have a unit test in my theme which is failing because of an unexpected type:

in_array() expects parameter 2 to be array, bool given
/var/www/coolwebsite/wp-content/plugins/wp-asset-manager/php/class-asset-manager.php:437

It looks like $in_footer should default to an empty array.

---

Caused by the following:

I'm registering a style with wp_register_style() in my theme:

	wp_register_style(
		'coolwebsite-google-fonts',
		'https://fonts.googleapis.com/css?family=Lora:400,400i,700,700i|Roboto+Condensed:400,700',
		[],
		'1.0'
	);

and specifying it as a dependency of another style which I'm loading with Asset Manager:

	$styles = [
		[
			'condition'   => 'global',
			'deps'        => [ 'coolwebsite-google-fonts' ],
			'handle'      => 'coolwebsite-global-css',
			'load_hook'   => 'wp_head',
			'load_method' => 'sync',
			'src'         => '/path/to/src.css',
			'version'     => '1.0',
		],
	];
	array_map( [ \Asset_Manager_Styles::instance(), 'add_asset' ], $styles );

[dlh01]

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